cum-gag
A cum-gag is a mouth cover that some guys are forced to wear with a dick-sized hole in it so another dude can stick his dick in so he can face-fuck the dude and have a cumgasm that the recipient has to swallow.
Some of my fellow roomies forced me to wear a cum-gag and took turns mouth-fucking me -- I had to swallow all their cum-loads and swallow their jizz - I got cum-drunk before they finished using me!